DLS is a non invasive technique and it is well established for measuring the size of molecules and particles in the submicron region.
This method offers several advantages:
ID100 Single Photon Counter
The ID100 single photon counters are based on a reliable silicon avalanche photodiode (APD) sensitive in the visible spectrum. The modules are able to detect weak optical signals down to the single photon level. With their very low dark count rates, timing resolution of 40 ps and dead time of 45 ns, the modules have an unmatched dynamic range.
The ID100 is easy-to-use, self-contained and can easily be integrated in every optical set-up. Besides a very narrow Instrument Response Function (IRF) it has an excellent timing stability up to count rates of at least 10 MHz. The ID100 is available in the following versions:
The ID100 modules exist in two grades, depending on the dark count rate specifications. For the Ultra-Low Noise grade, the dark count rate is less than 5 Hz for the ID100-20 and less than 20 Hz for the ID100-50 and ID100-MMF50. The key features are:
For the measurements mentioned below, the ID100-MMF50 detector was used to compute the scattered light intensity.